CVE-2023-27350
CriticalExploitedPublic exploitThis vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914).
Published Aug 9, 2023 · Updated Oct 21, 2025 · Also known as TR-23-0448
Key Facts
Patch immediately- CVE-2023-27350 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Papercut Mf, Papercut Ng, NG.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 18, 2023 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- Fixed versions are available, including Papercut Mf 20.1.7, Papercut Ng 20.1.7.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-27350 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class. The issue results from improper access control. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-18987.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Apr 21, 2023 | May 12, 2023 | Known |
| Industry KEV feed | Apr 18, 2023 | May 12, 2023 | Known |
| CIRCL KEV | Apr 21, 2023 | May 12, 2023 | Known |
| ENISA EUVD | Apr 21, 2023 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Papercut MfPapercut | See advisory | 20.1.7 |
| Papercut NgPapercut | See advisory | 20.1.7 |
| NG | >= 22.0.5 (Build 63914) | n/a |
Patched Releases
Papercut Mf
20.1.7
Papercut Ng
20.1.7
Timeline
Added to Industry KEV feed
Apr 18, 2023
Added to CISA KEV
Apr 21, 2023
Added to CIRCL KEV
Apr 21, 2023
Added to ENISA EUVD
Apr 21, 2023
Publicly disclosed
Aug 9, 2023
Last updated
Oct 21, 2025
Weakness Type
- CWE-284 Improper Access Control
References
- advisoryhttp://packetstormsecurity.com/files/171982/PaperCut-MF-NG-Authentication-Bypass-Remote-Code-Execution.html
- advisoryVulnCheck exploitation report
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2023-27350
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2023-27351
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-1129
FAQ
Common Questions.
This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914).
Affected: Papercut Mf; Papercut Ng; NG versions >= 22.0.5 (Build 63914). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 18, 2023 and is known to be used in ransomware campaigns.
Yes. It was added on Apr 21, 2023 with a federal remediation due date of May 12, 2023.
Public exploit code is available.
Fixed versions are available, including Papercut Mf 20.1.7, Papercut Ng 20.1.7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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